A clip from Bryan Kohberger’s arraignment on Monday has gone viral, where the Idaho quadruple murders suspect appeared to be flashing a half-smirk at his lawyer as the charges against him were read out.

The 28-year-old criminology Ph.D. student was formally charged with four counts of first-degree murder and burglary during his arraignment at 9 am PT in Latah County Court in Moscow, Idaho. Kohberger is accused of killing four University of Idaho students, Kaylee Goncalves, 21, Madison Mogen, 21, Xana Kernodle, 20, and Ethan Chapin, 20, on November 13. The victims were stabbed to death in an off-campus home that the three women shared with two roommates, who survived the attack.

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Many eagled-eyed internet sleuths pointed at the moment the charges were being read out in court. Kohberger appeared to glance at his attorney, Anne Taylor before flashing what people said was a half-smirk. Due to the angle of the camera, there was no way to tell if he actually flashed a smile or if was it merely a grimace.

Here are a few reactions to his facial expression as he was being formally charged for his crimes on Monday:

Kohberger refused to enter any plea at his arraignment on Monday. Instead, according to his attorney Anne Taylor said that he was “standing silent” on the charges, leaving the judge to enter a not-guilty plea on his behalf.

When the judge told Kohberger that he faces the death penalty or life in prison on the charges that have been brought against him, the suspect confirmed that he understood the charges and the penalties.

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Kohberger was arrested at his parent’s home in Pennsylvania on December 30, six weeks after the attack. His DNA was found on a knife sheath which was found by the investigators at the crime scene. CCTV camera captured a white Hyundai Elantra, which matched the vehicle he owned driving away from the area at the time of the murders.